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QtQuick wrong Device Pixel Ratio (DPR) when using multiple screens with different DPR

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  • B bdg85

    Hi,

    I have a retina mac book pro connected with a bigger screen:
    Screen1: LCD (retina, devicePixelRatio=2) 1280x800 (in device points)
    Screen2: LED Cinema Display (non retina, devicePixelRatio=1) 1920x1200

    The problem is this:
    If my QtQuick main window starts in Screen2, it detects the wrong screen (Screen1). Therefore, if I drag the window to Screen1, no signal is raised that the monitor is changed. This prevents me to update my OpenGL renderer with the new devicePixelRatio.

    I have written a simple test application in QML to show this:


    import QtQuick 2.4
    import QtQuick.Controls 1.3
    import QtQuick.Window 2.2
    
    ApplicationWindow {
        id: appWin
        title: qsTr("Hello World")
        width: 440
        height: 320
        visible: true
    
        Screen.onDevicePixelRatioChanged: {
            console.log("dpr changed");
            dprSignalId.text = "dpr changed at seconds: " + new Date().getSeconds();
        }
    
        Column{
           Text{
               id: screenTextId
               text: Screen.name + " " + Screen.devicePixelRatio + " " + Screen.width + "x" + Screen.height
           }
           Text{
               id: dprSignalId
           }
        }
    }
    

    B Offline
    B Offline
    bdg85
    wrote on last edited by
    #2

    Anyone?

    Just ask if the question was unclear: I may add further details.

    mrjjM 1 Reply Last reply
    0
    • B bdg85

      Anyone?

      Just ask if the question was unclear: I may add further details.

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #3

      @bdg85

      Your question is very clear. ( and i dont even know quick)

      Im just wondering if you would have better luck in the QT Quick group
      as what I have seen here is mostly c++

      1 Reply Last reply
      0
      • B Offline
        B Offline
        bdg85
        wrote on last edited by
        #4

        Thank you for the advice!
        I'll post there straight away.

        Feel free to remove this one for cross-posting issues.

        mrjjM 1 Reply Last reply
        0
        • B bdg85

          Thank you for the advice!
          I'll post there straight away.

          Feel free to remove this one for cross-posting issues.

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #5

          @bdg85
          Well unlike other forums
          cross-posting is not really frown upon here :)

          Good luck

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #6

            @mrjj well… It depends ;) Asking to move the post to a better suited sub-forum is the usual thing to do

            @bdg85 Did you check the bug report system ? IIRC, there was something about that (but I can't be 100% positive)

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            mrjjM 1 Reply Last reply
            0
            • SGaistS SGaist

              @mrjj well… It depends ;) Asking to move the post to a better suited sub-forum is the usual thing to do

              @bdg85 Did you check the bug report system ? IIRC, there was something about that (but I can't be 100% positive)

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #7

              @SGaist Oh - my bad- ok, And my move, you mean delete and post again. I assume.

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #8

                No no, you can ask an moderator or admin to do that

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                mrjjM 1 Reply Last reply
                0
                • SGaistS SGaist

                  No no, you can ask an moderator or admin to do that

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #9

                  @SGaist Aha, and you are a moderator or how would i spot one?

                  1 Reply Last reply
                  0
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #10

                    I looks like currently there's no easy way like a badge for that, would be nice though. Yes I am

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                    mrjjM 1 Reply Last reply
                    0
                    • SGaistS SGaist

                      I looks like currently there's no easy way like a badge for that, would be nice though. Yes I am

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #11

                      @SGaist
                      Oh ok, so the flag icon is not for that. ? So say i had a post that needed moving. Would I then message you or post a "please move" or how would one go about it ? Maybe this not the right place to ask. just wondering.

                      1 Reply Last reply
                      0
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #12

                        The flag is to tell moderator that there might be something fishy with a post/thread like content unrelated to Qt, spam etc. and they should look at it.

                        To move a thread, you would start a chat with a moderator to ask to move your thread when you see it's not in the right section.

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                        1 Reply Last reply
                        0
                        • mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #13

                          Is there any way to see from profile if they are a mod/admin ?
                          thank you for the clarification.

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                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #14

                            Currently it doesn't seem so

                            You're welcome

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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